The Research On Spectrum Sensing In Wireless Network

In the current wireless network, with the number of multimedia communications applications increased dramatically, the traditional static spectrum allocation strategy can not meet the increasing demand for spectrum. And inefficient utilization of spectrum has become a major bottleneck in the development of future mobile communication. Thus, as an intelligent spectrum sharing technology, cognitive radio technology received extensive attention in recent years. It can change the sending and receiving parameters adaptively according to its interactive sensing of the wireless communication condition it works in. Then it can use the available spectrum repeatedly, which improves the utilization of the available spectrum effectively. In cognitive radio networks, spectrum sensing as a core issue has been widely studied.Firstly, this paper outlines the concept, technical features and research status of cognitive radio. And then in the second chapter we classified and compared the current wireless network spectrum sensing technology. In the third chapter, we studied cognitive radio network architecture and put forward a new network model with a spectrum sensing layer. In the fourth chapter, the virtual spectrum sensing technology is introduced and a hybrid sensing mode is proposed that consists of the closed-loop power control sensing, passive energy sensing and the virtual spectrum sensing technology based on the distributed information sharing framework. Finally, we compared hybrid sensing pattern with the general sensing.Study results:1. we proposed a cognitive radio frequency spectrum detection layer network model to solve the hidden terminal problem. 2. Present a hybrid sensing mode that based on the virtual spectrum sensing. Using MATLAB software, simulation results show that the hybrid detection mode has a higher robustness than normal detection mode. According to the parameters in Table 4-1 Simulation results show that the average detection time of the hybrid detection mode is 0.048ms, the average detection time of the general test is 0.1ms.It's hard to avoid mistakes because of my limitations in theories and experiences, so I will be very appreciated if they are pointed out by every expert.